U.S. patent application number 12/369758 was filed with the patent office on 2009-11-19 for multi-stage coil for transformer, and coil winding method and apparatus for manufacturing the same.
Invention is credited to Jyunichi Ishizuki, Eisuke Maruyama, Toshio Ogata.
Application Number | 20090284338 12/369758 |
Document ID | / |
Family ID | 41315621 |
Filed Date | 2009-11-19 |
United States Patent
Application |
20090284338 |
Kind Code |
A1 |
Maruyama; Eisuke ; et
al. |
November 19, 2009 |
Multi-Stage Coil for Transformer, and Coil Winding Method and
Apparatus for Manufacturing the Same
Abstract
At least two or more flat rectangular wires having been fed
separately or simultaneously (two or more are superimposed) are
integrated by being pinched in a width direction and a thickness
direction by at least two or more pairs of rollers and are rolled
and formed simultaneously in a forming part to be formed into two
or more flat rectangular electric wires. The two formed electric
wires are stacked in layers in a wind-up part while being wound
into a disk shape to provide a multi-stage coil. Two or more
systems up to the forming part of the winding apparatus may be
disposed in a planar layout. Each system may supply one flat
rectangular electric wire separately, and the supplied electric
wires may be stacked in layers in the wind-up part while being
superimposed. The coil may be molded entirely.
Inventors: |
Maruyama; Eisuke; (Tainai,
JP) ; Ogata; Toshio; (Tainai, JP) ; Ishizuki;
Jyunichi; (Tainai, JP) |
Correspondence
Address: |
ANTONELLI, TERRY, STOUT & KRAUS, LLP
1300 NORTH SEVENTEENTH STREET, SUITE 1800
ARLINGTON
VA
22209-3873
US
|
Family ID: |
41315621 |
Appl. No.: |
12/369758 |
Filed: |
February 12, 2009 |
Current U.S.
Class: |
336/182 ;
242/520; 242/532; 29/605; 29/729; 336/192 |
Current CPC
Class: |
Y10T 29/5313 20150115;
Y10T 29/49071 20150115; H01F 27/327 20130101; Y10T 29/4902
20150115; H01F 41/069 20160101; H01F 41/077 20160101; H01F 27/29
20130101 |
Class at
Publication: |
336/182 ; 29/605;
336/192; 242/532; 242/520; 29/729 |
International
Class: |
H01F 27/28 20060101
H01F027/28; H01F 41/00 20060101 H01F041/00; H01F 27/29 20060101
H01F027/29 |
Foreign Application Data
Date |
Code |
Application Number |
May 15, 2008 |
JP |
2008-128193 |
Claims
1. A winding apparatus of a multi-stage coil for a transformer,
comprising: a supply part which supplies a plurality of flat
rectangular electric wires separately or in a superimposed state; a
forming part which rolls and forms an electric wire portion to be a
curved portion when the flat rectangular electric wires are wound
into a disk shape; and a wind-up part which stacks the flat
rectangular electric wires formed in the forming part in layers
while winding the flat rectangular electric wires into the disk
shape, wherein the forming part forms the plurality of flat
rectangular electric wires having the same shape and the same size
separately or simultaneously, and the wind-up part stacks the
plurality of formed flat rectangular electric wires in layers while
winding the flat rectangular electric wires into the disk shape in
a vertically superimposed state.
2. The winding apparatus of a multi-stage coil for a transformer
according to claim 1, wherein the forming part rolls and forms the
flat rectangular electric wires separately or in a superimposed
state, and the wind-up part winds the flat rectangular electric
wires into the disk shape simultaneously in a state in which two of
the flat rectangular electric wires are superimposed
vertically.
3. The winding apparatus of a multi-stage coil for a transformer
according to claim 1, wherein the forming part rolls and forms two
of the flat rectangular electric wires separately, and the wind-up
part separately winds two of the flat rectangular electric wires
having been formed separately into the disk shape so as to be a
state in which two of the flat rectangular electric wires are
superimposed vertically.
4. The winding apparatus of a multi-stage coil for a transformer
according to claim 3, wherein the supply parts and the forming
parts are disposed in two systems so as to be connected to the
wind-up part from the same direction or different directions in a
plane layout.
5. The winding apparatus of a multi-stage coil for a transformer
according to claim 1, wherein the forming part pinches the flat
rectangular electric wires fed by the supply part separately by at
least two or more pairs of rollers in order to integrate two or
more of the flat rectangular electric wires.
6. The winding apparatus of a multi-stage coil for a transformer
according to claim 1, wherein the forming part has a function of
working two or more of the flat rectangular electric wires into a
flat rectangle, a collapsed shape from a round wires or the
like.
7. The winding apparatus of a multi-stage coil for a transformer
according to claim 1, wherein the wind-up part includes a means for
reducing deformation due to by a head drop when the flat
rectangular electric wires fed from the forming part are wound into
the disk shape.
8. A winding method of a multi-stage coil for a transformer
including: rolling and forming an electric wire portion to be a
curved portion when winding a plurality of flat rectangular
electric wires which are supplied separately or in a superimposed
state into a disk shape; and stacking the flat rectangular electric
wires having been rolled and formed in layers while winding the
flat rectangular electric wires into the disk shape, further
including: forming the plurality of flat rectangular electric wires
having the same shape and the same size separately or
simultaneously, and stacking the plurality of formed flat
rectangular electric wires in layers while winding the flat
rectangular electric wires into the disk shape in a state in which
the flat rectangular electric wires are superimposed
vertically.
9. A multi-stage coil for a transformer, which are formed by
stacking the plurality of flat rectangular electric wires in layers
while the plurality of flat rectangular electric wires are wound
into a disk shape in a state in which the flat rectangular electric
wires are superimposed vertically, the plurality of flat
rectangular electric wires being rolled and formed to have an
electric wire portion to be a curved portion when being wound into
the disk shape.
10. The multi-stage coil for a transformer according to claim 9,
wherein a tap wire for extracting a predetermined voltage is led
out individually from the plurality of flat rectangular electric
wires in a state of being electrically connected thereto.
11. A multi-stage coil for a transformer which is wound by the
winding apparatus of a multi-stage coil for a transformer according
to claim 1.
12. A multi-stage coil for a transformer which is wound by the
winding method of a multi-stage coil for a transformer according to
claim 8.
Description
INCORPORATION BY REFERENCE
[0001] The present application claims priority from Japanese
application No. 2008-128193 filed on May 15, 2008, the content of
which is hereby incorporated by reference into this
application.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a multi-stage coil for a
transformer which is formed by winding at least two or more flat
rectangular electric wires in multiple stages and is used for a
mold transformer, and to a winding method and apparatus for
manufacturing the same.
[0004] 2. Description of Related Art
[0005] Conventionally, there has been described an art in which in
order to manufacture a multi-stage coil efficiently, a flat
rectangular electric wire is rolled in a sheet thickness direction
by paired pressure rollers by using motor power, and thereafter,
the flat rectangular electric wire is wound concentrically to form
an annular coil, and particularly, there has been stated that the
above described paired pressure rollers are configured to be able
to change the pressing angle of the flat rectangular electric wire
in the sheet thickness direction in accordance with the radius of
curvature of a curved portion of the coil (Japanese Patent No.
3996005). Further, as an art of manufacturing a winding coil of a
flat conducting wire (flat rectangular electric wire) by using a
round conducting wire with insulating coating, there has been
described an art in which after a round conducting wire with
insulating coating is passed between pressure rollers and deformed
to be a flat conducting wire, the conducting wire is wound up in
the form of a coil (JP-A-2000-69721).
[0006] In the art disclosed in Japanese Patent No. 3996005, the
rolling is performed in accordance with a predetermined radius of
curvature of the curved portion (corner portion) of the coil by
changing the pressing angle of the pressure rollers against the
flat rectangular electric wire. Therefore, when the radius of
curvature is small, or the rolling deformation amount in the sheet
thickness direction by the pressure roller is large, the insulating
material such as an insulating sheet or an insulating film which is
wound on the electric wire easily breaks at the time of rolling,
and therefore, there is the fear of occurrence of short circuit and
the like. Further, while the shape of the coil may change due to
the inclination of the pressure roller, the pressing amount against
the electric wire, the size variation of the electric wire material
and the variation of a material characteristic such as
malleability, it is difficult to modify the coil shape. Further, in
the case of the art disclosed in JP-A-2000-69721, it is nothing but
an art of providing a coil shape by automatically winding a flat
conducting wire (flat rectangular electric wire) formed by rolling
a round conducting wire with insulating coating, and there is the
fear of easily causing breakage of the insulating coating, and
reduction in conductor occupation rate and the like in the curve
portion (corner portion) of the coil.
[0007] Thus, as an art of relating to an annular coil for a
transformer and the like, and especially forming a curved portion
such as a corner portion of the coil by deforming the sectional
shape of the conductive element wire, there has been proposed, in
connection with a coil element wire portion forming the curved
portion of the annular coil, the coil element wire is rolled by a
first roller so that the deformation amount of a portion near the
outer peripheral side of the annular coil in its section is larger
than that of a portion near the inner peripheral side to achieve
bending deformation in the lengthwise direction, and thereafter,
the above described element wire portion which is deformed in
section is further deformed by being bent in the lengthwise
direction by a second roller. In the annular coil used for a
transformer or the like, breakage of the insulating coating and
reduction in conductor occupation rate are prevented even in a
curvilinear portion (curved portion) such as a corner portion of
the annular coil so as to eliminate the breakage of the insulating
coating and enable reduction of loss. There is proposed an annular
coil, a coil manufacturing device, a coil manufacturing method and
a transformer (JP-A-2006-196682).
[0008] In the art described in Japanese Patent No. 3996005, the
corner radius is formed by rolling one flat rectangular wire in the
sheet thickness direction by a forming roller, and a straight
portion is formed by linearly feeding the flat rectangular wire
after releasing rolling. That is, as a coil for a transformer, it
is a single-wound coil. However, in order to increase the
transformer capacity, increase in size of the flat rectangular
electric wire used for a coil, in other words, the sectional area
of a single wire is required. However, in the case of increasing
the size in the case of the single wire, there is a limit in
manufacturing, such as a technical problem in manufacturing the
electric wire itself, cost, a technical problem of the
manufacturing device itself such as a wire winding apparatus and
the like.
BRIEF SUMMARY OF THE INVENTION
[0009] Accordingly, while it is unnecessary to change the size of
each flat rectangular electric wire used for a coil from a
conventional one, there is the problem to be solved in respect of
establishing a multi-stage coil for a transformer capable of
corresponding to increase in transformer capacity by being combined
with another one, and a winding method and a winding apparatus for
manufacturing the same.
[0010] An object of the present invention is to provide a
multi-stage coil for a transformer capable of corresponding to
increase in capacity by combining, forming and winding at least two
or more flat rectangular wires (single wires), and winding method
and apparatus for manufacturing the same.
[0011] In order to solve the above described problem, a winding
apparatus of a multi-stage coil for a transformer according to this
invention includes a supply part which supplies a plurality of flat
rectangular electric wires separately or in a superimposed state, a
forming part which rolls and forms an electric wire portion which
will become a curved portion when the flat rectangular electric
wires are wound into a disk shape, and a wind-up part which stacks
the flat rectangular electric wires having been formed in the
forming part in layers while winding the flat rectangular electric
wires into the disk shape, and is characterized in that the forming
part forms the plurality of flat rectangular electric wires having
the same shape and the same size separately or simultaneously, and
the wind-up part stacks the plurality of formed flat rectangular
electric wires in layers while winding the flat rectangular
electric wires into the disk shape in a vertically superimposed
state.
[0012] Further, a winding method of a multi-stage coil for a
transformer according to this invention includes: rolling and
forming electric wire portions which will become curves portions
when a plurality of flat rectangular electric wires having been
supplied separately or in a superimposed state are wound into a
disk shape; and stacking the flat rectangular electric wires having
been rolled and formed in layers while winding the wires into the
disk shape, and is characterized by including: forming the
plurality of flat rectangular electric wires having the same shape
and the same size separately or simultaneously; and stacking the
plurality of formed flat rectangular electric wires in layers while
winding the wires into the disk shape in a state where the flat
rectangular electric wires are superimposed vertically.
[0013] Further, a multi-stage coil for a transformer according to
this invention is formed by stacking the plurality of flat
rectangular electric wires in layers, of which electric wire
portions corresponding to curve portions after being wound into a
disk shape have been rolled and formed, while winding the plurality
of flat rectangular electric wires into the disk shape in a state
where the flat rectangular electric wires are superimposed
vertically.
[0014] According to the present invention, when winding the flat
rectangular electric wires into disk shapes in multiple stages,
since at least two or more flat rectangular electric wires are
wound in multiple stages in a state where the two or more flat
rectangular electric wires are superimposed, it is possible to
obtain the same effect as the case of increasing the sectional area
of the electric wire. More specifically, in the winding apparatus,
the flat rectangular electric wires having been fed separately or
simultaneously (two or more are superimposed) are integrated by
being pinched in the width direction and the thickness direction by
at least two or more pairs of rollers, and are simultaneously
formed in a superimposed state, whereby two or more flat
rectangular electric wires can be simultaneously formed. The flat
rectangular electric wires thus formed can be stacked in layers
while winding the wires into a disk shape by a wind-up part.
Further, in another embodiment, it is possible to separately flat
rectangular electric wires one by one respectively, and
superimposing the electric wires to stack those in layers at the
wind-up part, whereby two or more flat rectangular electric wires
can be wound in multiple stages.
[0015] Further, by disposing two or more systems consisting of
parts up to the forming part of the winding apparatus in the left
and right direction in the plane layout or in a direction which
does not cause interfere with at least one winder, and separately
supplying flat rectangular electric wires one by one respectively
so as to superimposed and stack the flat rectangular electric wires
in layers at the wind-up portion, two or more flat rectangular
electric wires can be wound and stacked in multiple stages of disk
winding shapes. Further, by adding the function of working two or
more electric wires into a flattened one from round wires instead
of the flat rectangular electric wires, the electric wires can be
wound in multiple stages while working at least two or more wires
into a flat rectangular shape in-line.
[0016] According to the present invention, since at least two or
more electric wires are used, multiple stage winding is achieved by
stacking the wires in layers while winding those into a disk shape,
and increase in capacity of a winding coil for a transformer can be
realized, the transformer can be developed to a large model.
Further, the number of wires can be increased to be two or more,
and a route for applying the coil to a larger model can be
achieved. Further, according to the present invention, the
sectional area of the combined electric wires can be made large
without changing the size of the respective electric wires, and
therefore, increase in capacity of a mold transformer can be
realized. Further, in the winding apparatus, it is possible to
realize in-line operation of the working process such as flattening
work.
[0017] Other objects, features and advantages of the invention will
become apparent from the following description of the embodiments
of the invention taken in conjunction with the accompanying
drawings.
[0018] Hereinafter, the embodiments of winding apparatus of a
multi-stage coil for a transformer according to the present
invention will be described based on the drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0019] FIGS. 1A to 1C are general schematic views showing
embodiment 1 of a winding apparatus of a multi-stage coil for a
transformer according to the present invention;
[0020] FIG. 2 is a perspective view showing a forming part of the
winding apparatus shown in FIGS. 1A to 1C;
[0021] FIGS. 3A and 3B are general schematic views showing
embodiment 2 of a winding apparatus of a multi-stage coil for a
transformer according to the present invention;
[0022] FIG. 4 is a perspective view showing a forming part of the
winding apparatus shown in FIGS. 3A and 3B;
[0023] FIG. 5 is an explanatory view showing an outline of an
electric wire working device shown in FIGS. 3A and 3B;
[0024] FIGS. 6A and 6B are explanatory views showing the details of
the wire working device shown in FIG. 5;
[0025] FIGS. 7A and 7B are general schematic views showing
embodiment 3 of a winding apparatus of a multi-stage coil for a
transformer according to the present invention;
[0026] FIG. 8 is a bird's eye view of a coil for a transformer
according to the present invention;
[0027] FIG. 9 is a bird's-eye view of another coil for a
transformer according to the present invention;
[0028] FIGS. 10A and 10B are bird's-eye views of another coil for a
transformer according to the present invention; and
[0029] FIGS. 11A and 11B are bird's-eye views of still another coil
for a transformer according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
[0030] FIGS. 1A to 1C are general schematic views showing
embodiment 1 of a winding apparatus of a multi-stage coil for a
transformer according to the present invention, FIG. 1A is a plane
view, and FIG. 1B is a front view. As shown in FIGS. 1A to 1C, flat
rectangular electric wires 1a and 1b which have been wound on
individual wire drums 3a and 3b are superimposed in a vertical
direction immediately after being fed from the wire drums 3a and
3b, and are supplied to a wind-up part 8 in that state. The wind-up
part 8 is adjustable in position in a plane, and is provided so as
to be capable of ascending and descending by a mechanism like a
screw mechanism in accordance with stacking of the coil. A supply
part of the flat rectangular electric wires 1a and 1b includes a
feeding device 14 and various guide rollers. The flat rectangular
electric wires 1a and 1b are fed to a forming part (integrally
combining part) 6 while being fed by a predetermined amount by the
feeding device 14. The winding apparatus shown in FIGS. 1A to 1C is
the one which can be called a two-superimposing type, in which two
flat rectangular electric wires 1a and 1b having the same shape and
the same size are supplied separately, and superimposed on the way,
and the superimposed electric wires are simultaneously formed and
wound in a disk form. The disk winding mentioned here is not
limited to a circular shape, but includes winding in a rectangular
shape. In addition, the same shape and the same size mentioned here
do not necessarily have to be the same shape and same size in
strict meaning. That is, in the coil which is wound in the stacked
disk form, a little margin may be included between the coils in the
stacked state, and between the adjacent wound wires, and therefore,
it is sufficient that those have substantially the same shape and
size like different shapes and sizes but close to each other.
[0031] FIG. 2 is a perspective view showing the forming part of the
winding apparatus shown in FIGS. 1A to 1C. As shown in FIG. 2, the
forming part 6 includes a forming unit 7 having forming rollers 13
and 13, guide rollers 10 and 10 which guide feeding of the flat
rectangular electric wires 1a and 1b before forming, and a group of
guide rollers 12 which guides feeding of the flat rectangular
electric wires 1a and 1b after forming. The flat rectangular
electric wires 1a and 1b are guided in the width direction of the
electric wires by at least the pair of guide rollers 10 and 10, and
are fed into a space between the forming rollers 13 and 13.
[0032] The forming rollers 13 and 13 perform rolling work for
portions to be the curved portions of the disk winding, and perform
curving by more firmly rolling the outer side of the curved portion
in the curvature radius direction than the inner side thereof.
Accordingly, the guide rollers 10 and 10 accurately perform
position guide in the width direction. In this example, since the
wind-up part 8 winds up the coil as a circular coil, the flat
rectangular electric wires 1a and 1b which are linearly fed are
continuously rolled and formed by the forming rollers 13 and 13, to
form a curved combined electric wire 1c. The group of guide rollers
12 consists of at least three guide rollers, and guides the curved
combined electric wire 1c downwardly into a disk winding shape in
the wind-up part 8 to be stacked in layers.
[0033] In the example shown in FIGS. 1 to 2, the flat electric
wires 1a and 1b have been separately wound up around the wire drums
3a and 3b, but as shown in FIG. 1C, the same object can be also
achieved by setting a drum 3c having the combined electric wire 1c
(but before forming) with two or more wires being superimposed and
wound in advance. If the combined electric wire 1c in the state of
two wires superimposed is delivered from the beginning, the
combined electric wire 1c only has to be directly supplied to the
winding apparatus, and the superimposing step is not necessary. As
for the concrete winding mechanism, the disk winder as shown in
Japanese Patent No. 3996005 may be used.
Embodiment 2
[0034] FIGS. 3A and 3B are general schematic views showing
embodiment 2 of the winding apparatus of a multi-stage coil for a
transformer according to the present invention, FIG. 3A is a plane
view, and FIG. 3B is a front view. In embodiment 2 shown in FIGS.
3A and 3B, a supply part is two supply parts respectively having
routes in which the flat rectangular electric wires 1a and 1b which
are wound around individual wire drums 3a and 3b are vertically
disposed individually, and the flat rectangular electric wires 1a
and 1b which are respectively supplied by the supply parts are
formed by separate forming parts 6 and 6 respectively. The other
structure as an apparatus is similar to the one included in
embodiment 1 except for the electric wire working device, and
therefore, redundant explanation will be omitted.
[0035] FIG. 4 is a perspective view showing the forming part of the
winding apparatus shown in FIGS. 3A and 3B. As shown in FIG. 4, the
forming unit 7 in the forming part 6 includes a forming roller 13a
which forms the flat rectangular electric wire 1a, and a forming
roller 13b which forms the flat rectangular electric wire 1b. The
way of forming by the forming rollers 13a and 13b, the guide action
of the guide rollers may be equivalent to the forming rollers 13
and 13 and the guide rollers 10 and 12 shown in FIG. 2, and
therefore, redundant explanation will be omitted. The winding
apparatus according to embodiment 2 can be called a double deck
type because the vertically separate flat rectangular electric
wires 1a and 1b are delivered separately, are formed into a
circular arc shape by adding an angle thereto by the separate
forming rollers 13a and 13b, and are combined and superimposed in
the wind-up part 8 which is the final step so as to be stacked in
layers into a disk winding shape.
[0036] Concerning the winding apparatus of embodiment 2, electric
wire working devices 2a and 2b may be added for an example. FIG. 5
is an explanatory view showing the outline of the electric wire
working device adopted in the winding apparatus, and FIGS. 6A and
6B are explanatory views showing the details of the electric wire
working device shown in FIG. 5. FIG. 6A is an explanatory view of a
working roller, and FIG. 6B is a sectional view of the electric
wire formed into a flat rectangular shape. As shown in FIG. 5, by
forcefully feeding the electric wires 11a and 11b having a round
section for example, into the working roller 5 by the feeding
device 4, the electric wires 11a and 11b can be flattened from the
round shape and worked and formed into the flat rectangular shape
11c. The electric wires 1a, 1b, 11a and 11b are an electric wire
coated by winding a resin, namely, a film-like material spirally
thereon, or an electric wire coated with a layer such as an enamel
layer. These electric wires are formed by being rolled at a high
pressure (a force of the order of ton) in such a coated state.
Embodiment 3
[0037] FIGS. 7A and 7B are general schematic views showing
embodiment 3 of the winding apparatus of the multi-stage coil for a
transformer according to this invention, FIG. 7A is a plane view,
and FIG. 7B is a front view. Embodiment 3 which is shown in FIGS.
7A and 7B adopts a disk winding machine as shown in Japanese Patent
No. 3996005 described above, in other words, a winding apparatus in
which two or more systems including a system extending from the
wire drum 3a to a forming part 6a through the feeding device 14,
and a system extending from the wire drum 3b to a forming part 6b
through the feeding device 14 are respectively disposed in a plane
layout, and the electric wires respectively formed in the forming
parts 6a and 6b in the respective systems are superimposed at the
wind-up part 8 disposed near the center so as to be stacked in
layers into a disk winding shape. The winding apparatus is an
apparatus which may be called a plane double type.
[0038] In embodiment 3, the feeding device 14, the forming parts 6a
and 6b and the like do not have to be disposed in a confronting
direction in the winding apparatus as shown in FIGS. 7A and 7B, but
may be disposed in any of A direction and B direction of the arrow
9, and may be disposed in any direction, for example, so as to be
orthogonal to each other at 90 degrees as long as mutual
interference does not occur.
Embodiment 4
[0039] FIGS. 8 and 9 are bird's eye views of the coils for a
transformer according to the present invention. Since electric
wires are formed in a superimposed state 1c, and coils 15 and 16
for a transformer are manufactured, high capacity can be achieved.
FIG. 8 shows a coil of which the winding state is rectangular, and
FIG. 9 shows a coil of which the winding state is circular. These
coils for a transformer are finally molded entirely, and are
manufactured as mold coils for a transformer.
Embodiment 5
[0040] FIGS. 10A and 10B, and FIGS. 11A and 11B are bird's eye
views of the coils for a transformer according to the present
invention. FIGS. 10A and 10B are examples showing a coil 17 with
the winding state being rectangular, FIG. 10A is a view showing the
coil 17, and FIG. 10B is a view showing a mold which is applied to
the entire coil 17 in a transparent state. FIGS. 11A and 11B show
examples showing a coil 21 of which the winding state is circular,
FIG. 11A is a view showing the coil 21, and FIG. 11B is a view
showing a mold which is applied to the entire coil 21 in a
transparent state. In the example shown in FIGS. 10A and 10B, in
order to select the voltage to be extracted, overhanging portions
17a to 17c (rectangles having long sides) which extend outside from
intermediate coil portions corresponding to extraction positions
are formed and are led out while tap wires 19a to 19c to be
terminals are connected thereto. In the examples shown in FIGS. 11A
and 11B, in order to select the voltage to be extracted,
overhanging portions 21a to 21c (ovals) which extend outside from
intermediate coil portions corresponding to extraction positions
are formed and are led out while tap wires 23a to 23c to be
terminals are connected thereto. These coils 17 and 21 for a
transformer are entirely molded 18 and 22 finally, and are
manufactured as mold coils for a transformer. The tap wires 19a to
19c and 23a to 23c are led to the outside of the molds 18 and 22,
have the same sectional area as the two electric wires, and are
welded to the coils with silver solder, for example.
[0041] The present invention relates to a manufacturing apparatus
of a multi-stage coil with a plurality of wires, and a transformer,
which can increase the electric wire sectional area of a coil and
can increase the capacity, since at least two or more electric
wires are combined by forming and the coil is wound in multiple
stages in a mold transformer.
[0042] It should be further understood by those skilled in the art
that although the above description has been made on the
embodiments, the present invention is not limited to thereto, and
various changes and modifications may be made within the spirit of
the present invention and the scope of the accompanying claims.
* * * * *